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| TH8055 Single Wire CAN Transceiver Features and Benefits Fully compatible with J2411 Single Wire CAN specification for Class B in vehicle communications 30 A typical power consumption in sleep mode independent from CAN voltage range Operating voltage range 5...18V Up to 100 kbps high-speed transmission mode Up to 40 kbps bus speed Selective BUS wakeup Low RFI due to output wave shaping Fully integrated receiver filter Bus terminals proof against short-circuits and transients in automotive environment Loss of ground protection Protection against load dump, jump start Thermal overload and short circuit protection ESD protection of 4 kV on CAN pin (2kV on any other pin) Under- and over voltage lock out Bus dominant timeout feature Ordering Information Part No. TH8055 Temperature Suffix J (-40 ....125 C) Package DC (SOIC 150mil) General Description The TH8055 is a physical layer device for a single wire data link capable of operating with various CSMA/CR protocols such as the Bosch Controller Area Network (CAN) version 2.0. This serial data link network is intended for use in applications where high data rate is not required and a lower data rate can achieve cost reductions in both the physical media components and in the microprocessor and/or dedicated logic devices which use the network. The network shall be able to operate in either the normal data rate mode or a high speed data download mode for assembly line and service data transfer operations. The high speed mode is only intended to be operational when the bus is attached to an off-board service node. This node shall provide temporary bus electrical loads which facilitate higher speed operation. Such temporary loads shall be removed when not performing download operations. The bit rate for normal communications is typically 33 kbit/s, for high speed transmissions like described above a typical bit rate of 83 kbit/s is recommended. The TH8055 is designed in accordance to the Single Wire CAN Physical Layer Specification GMW3089 V1.4 and supports many additional features like undervoltage lockout , timeout for faulty blocked input signals, output blanking time in case of bus ringing and a very low sleep mode current. 390108055 Rev. 1.1a Page 1 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Functional Diagram VBAT 5V Supply and References TH8055 Biasing and VBAT Monitor Reverse Current Protection RC-Osc Wave Shaping TxD CAN Driver Time Out CANH Feedback Loop Input Filter MODE0 MODE CONTROL LOAD Loss of Ground Detection MODE1 Receive Comparator RxD RxD Blanking Time Filter Reverse Current Protection GND Figure 1- Block Diagram 390108055 Rev. 1.1a Page 2 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Functional Description TxD Input Pin - Logic command to transmit on the single wire CAN bus as follows: TxD Polarity TxD = logic 1 (or floating) on this pin produce an undriven or recessive bus state (low bus voltage) TxD = logic 0 on this pin produce either a bus normal or a bus high voltage dominant state depending on the transceiver mode state (high bus voltage) The transceiver provides an internal pull up current on the TxD pin which will cause the transmitter to default to the bus recessive state when TxD is not driven. TxD input signals are standard CMOS logic levels. Timeout Feature In case of a faulty blocked dominant TxD input signal the CANH output is switched off automatically after the specified TxD timeout reaction time to prevent a dominant bus. The transmission is continued by next TxD L to H transition without delay. If the TxD pin is driven to a logic low state while the sleep mode (Mode0=0 and Mode1=0) is activated, the transceiver not drive the CANH pin to the dominant state. Mode 0 and Mode 1 pins - are used to select The transceiver provides a weak internal pull down current on each of these pins which causes the transceiver to default to sleep mode when they are not driven. The mode input signals are standard CMOS logic level. M0 L H L H M1 L L H H Mode Sleep mode High speed mode Wake up Normal mode transceiver operating modes: Characteristics). High speed communications shall utilize the normal mode signal voltage levels as specified in Static Characteristics. Wake Up Mode This bus includes a selective node awake capability, which allows normal communication to take place among some nodes while leaving the other nodes in an undisturbed sleep state. This is accomplished by controlling the signal voltages such that all nodes must wake up when they receive a higher voltage message signal waveform. The communication system communicates to the nodes information as to which nodes are to stay operational (awake) and which nodes are to put themselves into a non communicating low power "sleep" state. Communication at the lower, normal voltage levels shall not disturb the sleeping nodes. Sleep Mode Transceiver is in low power state, waiting for wake up via high voltage signal or by mode pins change to any state other than 0,0. In this state, the CANH pin is not in the dominant state regardless of the state of the TxD pin. Normal mode Transmission bit rate in normal communication is 33 Kbits/s. In normal transmission mode the TH8055 supports controlled waveform rise and overshoot times. Waveform trailing edge control is required to assure that high frequency components are minimized at the beginning of the downward voltage slope. The remaining fall time occurs after the bus is inactive with drivers off and is determined by the RC time constant of the total bus load. High Speed Mode This mode allows high speed download with bitrates up to 100Kbit/s. The output waveshaping circuit is disabled in this mode. Bus transmitter drive circuits for those nodes which are required to communicate in high speed mode are able to drive reduced bus resistance in this mode (see Table Static 390108055 Rev. 1.1a Page 3 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver RxD Output pin - Logic data as sensed on the single wire CAN bus RxD polarity RxD = logic 1 on this pin indicates a bus recessive state (low bus voltage) RxD = logic 0 on this pin indicates a bus normal or high voltage bus dominant state RxD in Sleep Mode RxD do not pass signals to the micro processor while in sleep mode until a valid wake up bus voltage level is received or the Mode 0,1 pins are not 0,0 respectively. When the valid wake up bus voltage signal awakens the transceiver, the RxD pin signalised an interrupt (logic 0). However, if the Mode 0 & 1 pins are at logic 0, the transceiver returns to the sleep condition when the wake up bus voltage signal is not present. When not in sleep mode all valid bus signals will be sent out on the RxD pin. RxD will be placed in the undriven or off state when in sleep mode . RxD Typical Load Resistance: 2.5 kohms Capacitance: < 25 pF Bus LOAD pin - Resistor ground with internal open-on-loss-of-ground protection When the ECU experiences a loss of ground condition, this pin switch to a high impedance state. The ground connection through this pin is not interrupted in any transceiver operating mode including the sleep mode. The ground connection only is interrupted when there is a valid loss of ground condition. This pin provides the bus load resistor with a path to ground which contributes less than 0.1 volts to the bus offset voltage when sinking the maximum current through one unit load resistor. The transceiver's maximum bus leakage current contribution to VOL from the LOAD pin when in a loss of ground state is 50uA over all operating temperatures and 3.5 < VBAT < 18 volts . VBAT INPUT pin - Vehicle Battery Voltage The transceiver is fully operational as described in Table Static Characteristics over the range 5 < VBAT < 18 volts as measured between the GND pin and the VBAT pin. For 0 < VBAT < 5 volts, the bus is passive (not be driven dominant) and RxD is undriven (high), regardless of the state of the TxD pin (undervoltage lockout). 390108055 Rev. 1.1a Page 4 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver CAN BUS input/output pin Wave Shaping in normal and wake up mode Wave shaping is incorporated into the transmitter to minimize EMI radiated emissions. An important contributor to emissions is the rise and fall times during output transitions at the "corners" of the voltage waveform. The resultant waveform is one half of a sin wave of frequency 50 - 65 kHz at the rising waveform edge and one quarter of this sin wave at falling or trailing edge. Loss of ground If the CANH voltage decreases under the specified value below the ECU - ground, the LOAD pin is switched into high impedance state. The CANH transmission is continued until the undervoltage lock out voltage threshold is detected. Loss of battery In case of loss of battery (VBAT = 0 or open) the transceiver do not disturb bus communication. The maximum reverse current into power supply system doesn`t exceed 500A. Wave Shaping in high speed mode Wave shaping control of the rising waveform edges are disabled during mode. EMI emissions requirements during this mode. The waveform rise mode is less than one s. and falling high speed are waived time in this Short circuits If the CAN BUS pin is shorted to ground for any duration of time, an over temperature shut down circuit disables the output high side drive source transistor before the local die temperature exceeds the damage limit threshold. 390108055 Rev. 1.1a Page 5 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Electrical Specification All voltages are referenced to ground (GND). Positive currents flow into the IC. The absolute maximum ratings given in the table below are limiting values that do not lead to a permanent damage of the device but exceeding any of these limits may do so. Long term exposure to limiting values may affect the reliability of the device. Reliable operation of the TH8055 is only specified within the limits shown in "Operating conditions". Operating Conditions Parameter Battery voltage Operating ambient temperature Junction temperature Symbol VBAT TA TJ Min 5.0 -40 -40 Max 18 125 150 Unit V C C Absolute Maximum Ratings Parameter Supply voltage Short-term supply voltage Transient supply voltage Transient supply voltage Transient supply voltage CANH voltage Transient bus voltage Transient bus voltage Transient bus voltage DC voltage on pin LOAD DC voltage on pins TxD,MODE1,MODE0,RxD ESD capability of CANH Symbol VBAT VBAT.LD VBAT.TR1 VBAT.TR2 VBAT.TR3 VCANH VCANHTR1 VCANHTR2 VCANHTR3 VLOAD VDC VESDBUS Condition Load dump; t<500ms Jump start; t<1 min ISO 7637/1 pulse 1 [1] [1] Min -0.3 Max 18 40 27 Unit V V V -50 100 -200 -20 -50 100 [2] ISO 7637/1 pulses 2 VBAT=0 ISO 7637/1 pulse 1 V V V V V V V V V ISO 7637/1 pulses 3A, 3B [2] [2] 200 40 ISO 7637/1 pulses 2 via RT > 2k ISO 7637/1 pulses 3A, 3B -200 -40 -0.3 200 40 7 4000 Human body model Equivalent to discharge 100pF with 1.5k Human body model Equivalent to discharge 100pF with 1.5k At TA = 125 C in free air -4000 ESD capability of any other pins Maximum latch-up free current at any Pin Maximum power dissipation Thermal impedance Storage temperature Junction temperature VESD ILATCH Ptot JA TSTG TJ -2000 -500 2000 500 197 [3] 152 V mA mW K/W C C -55 -40 150 150 [1] [2] ISO 7637 test pulses are applied to VBAT via a reverse polarity diode and >1uF blocking capacitor . ISO 7637 test pulses are applied to CANH via a coupling capacitance of 1 nF. [3] The application board shall be realized with a ground copper foil area > 25mm2 . 390108055 Rev. 1.1a Page 6 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Static Characteristics VBAT = 5.0 to 18V, TA = -40 to +125C, unless otherwise specified All voltages are refered to ground, positive currents flow into the IC. Parameter Operating supply voltage Undervoltage lock out Overvoltage lock out Normal mode supply current, dominant Normal mode supply current, recessiv Wake up mode supply current Sleep mode supply current Symbol VBAT VBATUV VBATOV IBATNd IBATNr IBATW IBATS VBAT = 18V MODE0=MODE1=H, TxD=L, noload VBAT = 18V MODE0=MODE1=H, TxD open VBAT = 18V MODE0=L,MODE1=H, TxD=L VBAT = 18V TxD, RxD, MODE0, MODE1 open PIN CANH Bus output voltage Fixed wakeup output high voltage Offset wakeup output high voltage Recessive state output voltage Bus short circuit current Bus leakage current during loss of ground [1] Bus leakage current, bus positive Bus input threshold Fixed wakeup input high voltage threshold [2] Offset wakeup input high voltage threshold [2] Maximum reverse current into CANH Loss of ground detection threshold Voltage on switched ground pin VOH VOHWUFix VOHWUOffs VOL RL > 100 Normal, high speed mode 5.5V < VBAT < 18V Wake-up mode, RL>270 11.2V < VBAT < 18V Wake-up mode, RL>270 5.5V < VBAT < 11.2V Recessive state or sleep mode, Rload = 9.1 k, 40 -50 -10 1.8 6.15 VBAT -4.3 -1600 Loss of ground, VCANH=0V TxD high Normal, high-speed mode 3.5 9.7 VBAT -1.5 4.55 12 VBAT 0.20 150 10 10 2.2 8.1 VBAT -3.25 1 -200 0.5 V V V V mA A A V V V mA mV V Condition PIN VBAT 5.0 4.5 18.5 3.5 3.5 4 30 12 18 4.95 21 5 5 5 60 V V V mA mA mA A Min Typ Max Unit ICANSHORT VCANH = 0V, VBAT=18V, TxD=0V ILKNCAN ILKPCAN VIH VIHWUFix Sleep mode VBAT > 11.2V VIHWUOffs Sleep mode ICANHOVlob VCANH > VBAT VCANHLOG TxD open PIN LOAD VLOAD IRTH = 5mA 390108055 Rev. 1.1a Page 7 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Parameter Symbol Condition Min Typ Max Unit PIN TXD,MODE0,MODE1 High level input voltage Low level input voltage TxD pull up current MODE0 and 1 pull down current VIH VIL IIL_TXD TxD=L, MODE0 and 1=H PIN RXD Low level output voltage High level output leakage RxD output current VOLRxD IIHRxD IRxD IRxD = 2mA VRxD=5V VRxD=5V -10 0.4 10 70 V A mA 20 15 IIH_MODE0 MODE0 and 1=H 3.4 1.6 50 50 V V A A Overtemperature protection Thermal shutdown [3] Thermal recovery [3] TSD TREC 155 130 180 150 C C [1] [2] [3] Leakage current in case of Loss of ground is the summary of both currents ILKN_CAN and ILKN_RTH . Wake up is detected at the minimum of VihWuFix or VihWuOffset. thresholds not tested in production, guaranteed by design, only switch on/off tested 390108055 Rev. 1.1a Page 8 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Dynamic Characteristics All dynamic values of the table below refer to the timing diagrams on page 6. (5.5V VBAT 18V, -40C TA 125C, unless otherwise specified) Parameter Transmit delay in normal and wake up mode Transmit delay in high-speed mode Receive delay in all active modes Receive delay in all active modes Input minimum pulse length, all active modes Input minimum pulse length, all active modes Bus output rise time (30%-70%) Bus output fall time (70%-30%) Bus output rise time (30%-70%) Bus output fall time (70%-30%) Wakeup filter time delay Receive blanking time after TxD L-H transition TxD timeout reaction time TxD timeout reaction time Delay from normal to high speed modes Delay from normal to wake up mode Delay from normal to sleep modes Delay from sleep to normal and wake up mode Symbol tT tTHS tDR tRD trp tpr tR tF tRHS tFHS tWUF tRB tTOUT Condition max. and min bus load, 50% TXD high level to VCANH=2.2V max. and min bus load, 50% TXD high level to VCANH=2.2V CANH to RxD, VCANH=2V , RxD=L to H CANH to RxD, VCANH=2V , RxD=L to H CANH to RxD, VCANH=2V , RxD=H to L CANH to RxD, VCANH=2V , RxD=L to H Normal mode, max. and min bus loads,VBAT=12V Normal mode, max. and min bus loads, VBAT=12V High-speed mode, max. and min. bus loads, VBAT=12V High-speed mode, max. and min. bus loads, VBAT=12V See Timing diagrams See Timing diagrams Normal and high speed mode 1.6 10 2 12 20 30 30 500 50 Min 3 0.2 0.3 0.3 0.2 0.2 0.6 1.3 Typ Max 6.3 1.5 1 1 1 1 1.4 4.7 0.5 2.5 70 6 Unit s s s s s s s s s s s s ms ms s s s s tTOUTWA Wake up mode tDNHS tDNHV tDNS tdsnwu 390108055 Rev. 1.1a Page 9 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Bus loading requirements Parameter Number of system nodes Network distance between any two ECU nodes Node series Inductor Resistance EMC Inductor voltage drop Ground offset voltage Device capacitance (unit load) Network total capacitance Device resistance (unit load) Device resistance (min load) Network total resistance Network time constant [1] High speed mode network resistance to GND Bus length Rind Vind Vgoff Cul Ctl Rul Rmin Rtl Rload 198 396 9009 2000 270 1 100 4596 4 185 9100 220 Symbol Min 2 Typ Max 32 60 2.3 0.3 0.8 242 13700 9191 m V V pF pF s Unit Timing Diagrams VTxD 50% t tT VCANH 70% 30% t tR tD tF tDR VRxD 50% t Figure 2 - Input/Output Timing [1] The network time constant incorporates the bus wiring capacitance. The minimum value is selected to limit radiated emission. The maximum value is selected to ensure proper communication modes. Not all combinations of R and C are possible. 390108055 Rev. 1.1a Page 10 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver VCANH VIHWU VIH t twu tWU tWUF VRxD tWU < tWUF wake up interrupt t Figure 3 - Wake Up Filter Time Delay VTxD 50% t VCANH Vih t VRxD 50% t tRB Figure 4 - Receive Blanking Time 390108055 Rev. 1.1a Page 11 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Application Circuitry 1N4001 VBAT 2.2uF Voltage regulator 100nF VBAT +5V ECU connector to Single Wire CAN Bus 2.5kOhm VBAT 5 4 47H 7 CANH CAN controller RxD TH8055 2 MODE0 3 MODE1 1 TxD 8 Copper Foil Heat Sink >25mm2 9.1kOhm 220pF 6 LOAD ESD Protection TPSMA16A or MMBZ27VCLT1 or equivalent - if needed GND Figure 5 - Application Circuitry VBAT 100nF 47H CANH 9.1k; 1% VBAT 100nF CANH TX0 RX0 47H TH8055 TX0 RX0 NSTB EN 220pF RTH CAN Controller TH8055 9.1k; 1% 220pF NSTB EN Figure 6 - CAN Network Circuitry 390108055 Rev. 1.1a Page 12 of 15 CAN-Bus Line CAN Controller RTH Jan 2002 TH8055 Single Wire CAN Transceiver Pin Description TxD MODE0 MODE1 RXD 1 2 8 7 GND CANH LOAD VBAT TH8055 3 4 6 5 Pin 1 2 3 4 5 6 7 8 Name TXD MODE0 MODE1 RXD VBAT LOAD CANH GND IO-Typ I I I O Description Transmit data from core to CAN Operating mode select input 0 Operating mode select input 1 Receive data from CAN to core Battery input voltage Resistor load (loss of ground low side switch ) I/O Single wire CAN bus pin Ground 390108055 Rev. 1.1a Page 13 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Mechanical Specification E H 123 D A1 e b A L Small Outline Integrated Circiut (SOIC), SOIC8 NB, 150 mil All Dimension in mm, coplanarity < 0.1 mm D min max 4.85.0 E 3.80 4.00 H 10.00 10.65 A 5.80 6.20 A1 0.10 0.25 e 1.27 b 0.33 0.51 L 0.40 1.27 08 0.10 All Dimension in inch, coplanarity < 0.004" min max 0.189 0.197 0.150 0.157 0.228 0.244 0.053 0.069 0.004 0.010 0.050 0.013 0.020 0.016 0.050 0 8 390108055 Rev. 1.1a Page 14 of 15 Jan 2002 TH8055 Single Wire CAN Transceiver Your notes Important Notice Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2000 Melexis NV. All rights reserved. For the latest version of this document. Go to our website at www.melexis.com Or for additional information contact Melexis Direct: Europe and Japan: Phone: +32 1367 0795 E-mail: sales_europe@melexis.com All other locations: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com QS9000, VDA6.1 and ISO14001 Certified 390108055 Rev. 1.1a Page 15 of 15 Jan 2002 |
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